Centrifugal drying-machine.



W. G. MITCHELL.

OENTEIFUGAL DRYING mcmn.

LPPLIOA'IIOH IILED D120. 28, 11MB.

Patented Aug.9, 1910.

.OMIIGHELL.

UNITED STATES PATENT OFFICE.

WILLIAM CLARK MITCHELL, OF SYDNEY, NOVA SCOTIA, CANADA.

CENTBIFUGAL DRYING-MACHINE.

I To all whom it may concern:

Be it known that I, \VILLIAM CLARK MrrcnsnL. of Sydney. in the Province of Nova Scotia, Canada. have invented certain new and useful Improvements in Centrifu- 'gal Drying-Machines, of which the following is a specification.

.ly invention relates to improvements in centrifugal drying machines of the type in which moisture is extracted from material which is in a more or less finely divided a rotary conical receptacle having an J).-

clined and perforated wall, in combination with a tank for receiving the water passing throu h the receptacle, and a rigid casing' inclosing the tank, the inner wall of said casing being adapted to guide the material which flows over the upper or outer end of the receptacle owing to the upward movement imparted by l he inclined walls when the receptacle is rotated. The upper or outer end of the receptacle is outwardly turned, curved or dan ed to fit over the inwardly turned, curved or flanged upper or outer end of the tank to prevent the water from the tank being thrown by centrifugal force over the upper or outer end 0% the tank and into the spacebetween the tank and the casing where it would mingle withthe dried coal. The rigid outer casing is curved inwardly at its top and then extends inwardly and-downwardly into the rotary conical receptacle, being spaced therefrom and having the same general shape as the latter.

Three embodiments of the invention and the details of the construction are more fully set forth and described in the accompanying specification and drawing.

In the drawing, Figure l is a vertical section through one form of a paratus. Fig. 2 is a vertical section througli another form. Fig. 3 is a vertical section through another form. Fig. 4 is a section on the line 2-2, Fig. 1.

In the drawings, like characters of refer- Spccification of Letters Patent. Application filed December 28. 1908. Serial No. 469.718.

Patented Aug. 9, 191(1 cnce indicate corresponding parts in each figure.

Referring to the drawings, A represents a rotary receptacle having its wall constructed to permit the passage of liquid therethrou h, as by the formation of a plurality of periorations 10 therein, and having the wall inclined outwardly and upwardly from the bottom the rece )tacle illustrated having the .or outer edge. of the rotary receptacle, the

upper or outer edge of the said wall 12 being-prmided with an inwariilly-turned or curved flange 14 extending parallel with the flange l2, whereby a close joint will be made between the two parts and the escape ()f-ll(1llltl prevented, and yet the centrifugalacti n will not he impeded. The liquid is wil ii-awn from the tank, either through a suitable pipe 15 or other means. The tank is secured rigidly to a base or support.

To deliver the wet uultcrial to the receptacle and guide and retain the dried mate rial passing out of the rcccptarle. a casing I) is proiidcd, the upper edge of which is curved at 16 to extend over the top of the rotary receptacle, whereby the dried material passing out of the rotary receptacle will be guided by the curved interior wall at the top of the casing and pass dowmvardly in the annular space 17 between the tank C and the casing D. The general shape of the easmg D is that of a cylinder and it is secured rigidly to a base. Its upper or outer end is,

as shown in Figs. 1, 2 and 3. carved inwardly and downwardly so as to dip into the receptacle and form a conical hopper This hopper is imperforate and is spaced from the sides and bottom of the receptacle and is open at the bottom.

In operation, the conical perforated receptacle A is rotated at a high speed, and the material containing the moisture, such as the coal. is fed into the hopper E. When this material falls on the bottom of the re hu Manama...

t-eptat-le it is by eentrit'ugalforce, thrown again t the inner wall. whieh being int-lined, eauses it to move upwardly in the spare betwt-en the hopper l. and the reeeptaele until it l'eat'hes the top, w-lienthe material will strike the. inner side of the curved upper edge. l of the easixig,-n' liit-li heing stationary, the centrifugal aetion on the material erases and the material drops by gravity through the annular space 17 into suitable receptacles whieh will be provided to reeeive Z \Vhatever moisture or liquid of curved side of the casing and drop by gravity, where it the easing were given a movement. the eentrit'ugal time would hold th material against the t p of the ea ing. thus clogging the operation of the mat-lune. It should further be observed that the in wanlly !urne.d or curved flange H on the tank C prevents the m i ture. from being thrown or blown over the top m" the same oninto be space 17. This llange is thus \er elt'e tive in preventing mixture of the dried eoustituents and th liquid after they have pass d through the separator.

In the form shown in Fig. if. the shaft it extends dmvnwardlv from the bottom 11 of the receptacle. and th parallel llanges l9 and 19 l'ietween the tank and revolving reeeptaele are made U-shaped in form and not carved. To prevent the liquid or moisture pt .sing down the. opening 21 left in the tank (J. an annular flange 22 is lornn-(l mound the opening and extends upwardly and lit: closely around the bottom 11.

In th form shown in Fig. 4. the recepta le is formed with a lower eonieal portion 2 and an upper cylindrical portion 24. The preferable construction is shown in l*igs. l and 2.

From the. above. it will be seen that the material may be passed eontinuously through the apparatus, and by suitable regulation of the same. the whole or any part of the moistur therein may be extracted front the same.

The appara us shown and described has been giv n a thorough test with coal containing ighty p r eent. moisture, and I. have sueeeeded in obtaining a product having onlv live per e nt. moisture.

Having thus described my invention, I nimi- 2. in a eentm'agal drier, the combination Of the revoluhle oni al reee 'itaole ha ring its. wall perforated and an outwardlv turned flange provided at the upper end.n| ans eonnoeted with th bottom th reof for r tating the reeeptaele. a tank lilting around the receptacle. and having an inwardly turned flange at the upper end. the flange of the tank fitting \vitlzin.the llange of the reeeptaele, and a stationary easing having its wall spat-ed from the sideof the tank and its upper nd rurved inwardly ov r and spat-ed from the npper'ends of the tank and reeeptaele and then evtended do\\'nw:u'dl v into the reeeptat-le and shaped to form a eonieal hopper the bottom of which is open and the sides spaeed from the )erl'orated wall of the reeepta l the outlet or the material pass ing upward'v between the t'eceplzn-le and the hopper being defined by the moving flanged upper end of the re(-- otaele and the rigid eurved upp r end of easing whereby th material is caused to strike against th said eurved stationary upper end of the easing and then drop by gravity through the space between the casing andthe tank.

In a eentril'ugal drier, the eomhinat: n

of the reroluble eonieal reeeptaele having its wall perforated. and an outwardly-curved llange. provided at the upper end thereof. a shaft eonneeted at its lower end with the bottom of th re t-ptaele for imparting rotation to the latter. a rigidly mounted tank fitting around the reeet'itacle and having its bottom and sides spaeed from the receptacle and provided with an inwardly eurved flange at its upp r end, the flange of the tank lilting within the flange of the reeeptaele, an

outlet for the tank, and a stationary casing having its side walls spaced from the side of the tank and its upper end curved inwardty over and spared from the upper ends of the tank and receptacle and then extended downwurdly into the receptacle and shaped to form a conical ho )pL'I'. the bottom of which is open and the sides thereof spaced from the perforated wall of the reeeptaele, the outlet for the material (passing upwardly between the reeeptaele an the hopper being defined by the moving flanged upper end of the receptacle and the rigid curved upper end of the casing whereby the material is caused to strike against the said curved stationary upper part of the casing and then dropped by gravity through the space between the casing and the tank, said space being provided with an outlet at its bottom.

In witness whereof I have hereunto set my hand in the presence of two Witnesses.

WILLIAM CLARK MITCHELL.

\Vitnesses: i

I. 0. Elm,

W ALTER (aown 

